Phonorhynchoides haegheni Artois & Schockaert, 2001

Artois, Tom J. & Tessens, Bart S., 2008, Polycystididae (Rhabditophora: Rhabdocoela: Kalyptorhynchia) from the Indian Ocean, with the description of twelve new species, Zootaxa 1849, pp. 1-27 : 20

Phonorhynchoides haegheni Artois & Schockaert, 2001

( Fig. 5 A–B)

Known distribution. Florida ( USA), S Hutchinson Island; Galapagos: several localities ( Artois & Schockaert 2001).

New localities in the Indian Ocean. South-west Sulawesi ( Indonesia): Soreang, fine volcanic sand from the eulittoral (27/09/1984).

New localities outside the Indian Ocean. Curaçao: Playa Canoa, coarse, clean sand from a small beach sheltered from the waves by a rocky tongue of land (10/12/1998).

Material. All material from the original description (see Artois & Schockaert 2001). Two animals studied alive and whole mounted, one from Indonesia and one from Curaçao.

Remarks. The (damaged) prostate stylet type IV of the Indonesian specimen is 55 µm long and proximally 9 µm wide, tapering to 4 µm distally. The accessory stylet type IV of this specimen is 174 µm long, resulting in a stylet/accessory stylet ratio of ± 1/3. The specimen from Curaçao has much longer stylets: prostate stylet type IV 92 µm long, 13 µm wide proximally, 7 µm distally; accessory stylet 269 µm long. The stylet/accessory stylet ratio, however, is the same as in the specimen from Indonesia: ± 1/3. The measurements on the new material more or less fit the range of variation observed earlier (see Artois & Schockaert 2001): stylet lengths of 87–98 µm (Florida) and 47–58 µm (Galapagos) and accessory stylets between 209–325 µm in length with those measured in the Florida specimens generally the largest. The relative length of the prostate stylet type IV (compared to the accessory stylet type IV) in the specimens from Indonesia and Curaçao (1/ 3) is identical to that of the Florida population (1/3), while that of the Galapagos population is a little shorter (1/5). In the living animals and in the whole mount of the specimen from Curaçao the muscular part of the bursa was clearly seen.

Discussion. See the discussion after the description of P. linguatus .

Figures

FIGURE 5. Phonorhynchoides haegheni Artois & Schockaert, 2001 A, Prostate stylet type IV (from the specimen from Indonesia). B, Accessory stylet type IV (from the same specimen from Indonesia). Phonorhynchoides linguatus n. sp. C, Prostate stylet type IV (from the holotype). D, Accessory stylet type IV (from the holotype). E, Habitus (from a live animal). F, Caudal body end (from a live animal).